Other
mussels in the area besides Perna viridis (Tampa Bay), include Perna viridis
(Trinidad), Perna perna (Texas).All
the mussels from Trinidad (~30) had a distinct green outer margin.Virtually all the green mussels collected
from Tampa Bay had entirely green shells.The brown mussel here is entirely brown and has a much thicker shell.The green mussel shells have been very thin
in comparison.